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PCA9674BS Datasheet(PDF) 11 Page - NXP Semiconductors |
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PCA9674BS Datasheet(HTML) 11 Page - NXP Semiconductors |
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11 / 32 page  PCA9674_PCA9674A_5 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 05 — 15 June 2009 11 of 32 NXP Semiconductors PCA9674/74A Remote 8-bit I/O expander for Fm+ I2C-bus with interrupt 7.2.1 Software Reset The Software Reset Call allows all the devices in the I2C-bus to be reset to the power-up state value through a specific formatted I2C-bus command. To be performed correctly, it implies that the I2C-bus is functional and that there is no device hanging the bus. The Software Reset sequence is defined as following: 1. A START command is sent by the I2C-bus master. 2. The reserved General Call I2C-bus address ‘0000 000’ with the R/W bit set to 0 (write) is sent by the I2C-bus master. 3. The PCA9674/74A device(s) acknowledge(s) after seeing the General Call address ‘0000 0000’ (00h) only. If the R/W bit is set to 1 (read), no acknowledge is returned to the I2C-bus master. 4. Once the General Call address has been sent and acknowledged, the master sends 1 byte. The value of the byte must be equal to 06h. a. The PCA9674/74A acknowledges this value only. If the byte is not equal to 06h, the PCA9674/74A does not acknowledge it. If more than 1 byte of data is sent, the PCA9674/74A does not acknowledge any more. 5. Once the right byte has been sent and correctly acknowledged, the master sends a STOP command to end the Software Reset sequence: the PCA9674/74A then resets to the default value (power-up value) and is ready to be addressed again within the specified bus free time. If the master sends a Repeated START instead, no reset is performed. The I2C-bus master must interpret a non-acknowledge from the PCA9674/74A (at any time) as a ‘Software Reset Abort’. The PCA9674/74A does not initiate a reset of its registers. The unique sequence that initiates a Software Reset is described in Figure 10. Fig 9. Device ID address R/W 002aac116 1 1 1 1 1 0 0 Fig 10. Software Reset sequence 002aac262 0 0 0 0 0 0 0 A S 0 SWRST Call I2C-bus address START condition R/W acknowledge from slave(s) 0 0 0 0 1 1 0 0 SWRST data = 06h A acknowledge from slave(s) P PCA9674/74A is(are) reset. Registers are set to default power-up values. |
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